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4H2S + Co(NO3)2 → 3S + 2NO + CoS + 4H2O

The reaction of hydrogen sulfide and cobalt(II) nitrate yields sulfur, nitrogen monoxide, cobalt(II) sulfide, and water (Other reactions are here). This reaction is an oxidation-reduction reaction and is classified as follows:

Table of contents
  1. 1Reaction data
  2. 2Thermodynamic changes
  3. 3References
  4. 4Related reactions
  5. 5Related categories

Reaction data

Chemical equation

General equation

Reaction of reducing species and oxidizing species
Reducing speciesReducing agent + Oxidizing speciesOxidizing agent
ProductOxidation product + ProductReduction product

Oxidation state of each atom

Reactants

Chemical formulaNameCoefficientTypeType in general
equation
H2SHydrogen sulfide4
Reducing
Reducing
Co(NO3)2Cobalt(II) nitrate1
Oxidizing
Oxidizing

Products

Chemical formulaNameCoefficientTypeType in general
equation
SSulfur3
Oxidized
NONitrogen monoxide2
Reduced
CoSCobalt(II) sulfide1
H2OWater4

Thermodynamic changes

Changes in standard condition (1)

Reaction of hydrogen sulfide and cobalt(II) nitrate
4H2SGas + Co(NO3)2Crystalline solid
3SCrystalline solidrhombic + 2NOGas + CoSCrystalline solid + 4H2OLiquid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−542.6
per 1 mol of
−135.7
per 1 mol of
−542.6
per 1 mol of
−180.9
per 1 mol of
−271.3
per 1 mol of
−542.6
per 1 mol of
−135.7

Changes in standard condition (2)

Reaction of hydrogen sulfide and cobalt(II) nitrate
4H2SGas + Co(NO3)2Crystalline solid
3SCrystalline solidmonoclinic + 2NOGas + CoSCrystalline solid + 4H2OLiquid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−541.6
per 1 mol of
−135.4
per 1 mol of
−541.6
per 1 mol of
−180.5
per 1 mol of
−270.8
per 1 mol of
−541.6
per 1 mol of
−135.4

Changes in aqueous solution

Reaction of hydrogen sulfide and cobalt(II) nitrate
4H2SUn-ionized aqueous solution + Co(NO3)2Ionized aqueous solution
3SCrystalline solidrhombic + 2NOGas + CoSCrystalline solid + 4H2OLiquid
Standard enthalpy
of reaction
ΔrH°
kJ · mol−1
Standard
Gibbs energy
of reaction
ΔrG°
kJ · mol−1
Standard entropy
of reaction
ΔrS°
J · K−1 · mol−1
Standard heat
capacity of reaction
at constant pressure
ΔrCp°
J · K−1 · mol−1
per 1 mol of
Equation
−414.0
per 1 mol of
−103.5
per 1 mol of
−414.0
per 1 mol of
−138.0
per 1 mol of
−207.0
per 1 mol of
−414.0
per 1 mol of
−103.5

Thermodynamic data of reactants

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
H2S (g)-20.63[1]-33.56[1]205.79[1]34.23[1]
H2S (ao)-39.7[1]-27.83[1]121[1]
Co(NO3)2 (cr)-420.5[1]
Co(NO3)2 (ai)-472.8[1]-276.9[1]180[1]
Co(NO3)2 (cr)
2 hydrate
-1021.7[1]
Co(NO3)2 (cr)
3 hydrate
-1325.9[1]
Co(NO3)2 (cr)
4 hydrate
-1630.5[1]
Co(NO3)2 (cr)
6 hydrate
-2211.20[1]452[1]
* (g):Gas, (ao):Un-ionized aqueous solution, (cr):Crystalline solid, (ai):Ionized aqueous solution

Thermodynamic data of products

Chemical formulaStandard enthalpy
of formation
ΔfH°
kJ · mol−1
Standard Gibbs
energy of
formation
ΔfG°
kJ · mol−1
Standard
molar entropy
S°
J · K−1 · mol−1
Standard molar
heat capacity at
constant pressure
Cp°
J · K−1 · mol−1
S (cr)
rhombic
0[1]0[1]31.80[1]22.64[1]
S (cr)
monoclinic
0.33[1]
S (g)278.805[1]238.250[1]167.821[1]23.673[1]
NO (g)90.25[1]86.55[1]210.761[1]29.844[1]
CoS (cr)-82.8[1]
H2O (cr)
H2O (l)-285.830[1]-237.129[1]69.91[1]75.291[1]
H2O (g)-241.818[1]-228.572[1]188.825[1]33.577[1]
* (cr):Crystalline solid, (g):Gas, (l):Liquid

References

List of references

  1. 1